Keystones — Lintel
Five GCSE retrieval questions · 23 November 2012 · mathsvault.uk/keystones
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1. Number Converting to standard form
Write 0.00096 in standard form
Answer: 9.6 × 10-4 -
2. Algebra Factorising monic quadratics
Factorise: x² + 2x - 80
Answer: (x + 10)(x - 8) -
3. Geometry SOHCAHTOA — missing length
Adjacent = 24cm, angle = 36°. Find opposite. Give your answer to 2 decimal places
Answer: 17.44cm -
4. Ratio Mixed ratio problems
Black, white and yellow sweets are in the ratio 6:6:4. What fraction of the sweets are white?
Answer: 3⁄8 -
5. Statistics Mean
The mean of 6 numbers is 33. If 5 of them are 37, 25, 46, 30, 15, what is the missing number?
Answer: 45